Superheater for marine boilers



Nov. 15, 1932.

- E. A. GEOGHEGAN 1,837,754

SUPERHEATER FOR MARINE BOILERS Filed Jan. 8, 1931 2 Sheets-Sheet l M @M W l ENTOR BY ATTORNEYS Nov. 15, 1932. A GEOGHEGAN 1,887,754

SUPERHEATER FOR MARINE BOILERS Filed Jan. 8, 1931 2 Sheets-Sheet 2 FIG. 3.

BY "ATTORNEY- Patented Nov. 15, 1932 UNITED" STATES P TE T E EDWARD ARTHUR GEOGHEGAN, OF NEW YORK, N. YQASSIGJSTOR TO SU'IEER-S'IJE AJYI'.

GENERATORCOMPANY, OF NEW YORK, N.-Y.,-A. COBBORA TION OF DELAWARE SUPER/HEATER ron, MARINE BOILERS I Application filed January 8', 1931', Serial No. 507,359; and in Great'Britain June 2, 1930i 7 This invention relates to superheaters and Other objects of the'present invention're more particularly to marine superheaters late to the provision of certain supplementary adapted for installation in marine boilers of connections between the headers and-water the so-called Scotch type. Heretofore, when spacesof the-boiler and certain novel arrange superheaters have-been installed in marine ments'of valves whichwill be hereinafter'de boiler installation it has beenthe practice to scribedin furtherdetail. I dispose the superheater elements either in the Further and'other objects of'the'present'infire tubes of the boileror in other cases the vention will be" hereinafter set forth in the installation of the superheater has been efaccompanying specification'and claims-and fected in the breechingi Neither of these 10- shown i'n'the drawingsgwhichbyway ofillus cations afford the best disposition for the tration show'what'I now considerto bepre superheater. V ferredem'bodiments ofmyimprovement. V

Scotch marine boilers'a's heretofore con- In the drawings": 7 structed; have comprised one or more fur- Figure 1 is a central sectional viewfof a 5 naces within the boiler shell. These furnaces Scotch marin'eboilershowing my improved extend rearwardto a vertically disposed comsuperheater disposed in the internal combus bustion chamber associated with each furtion spaceoftheboiler} The view alsoshows nacel These combustion chambers are in a superheater unit in'dotteddinesinthe posi turn in communication with the fire tubes of tion which it assumes in being passed" into 20 the boiler. The fire tubes in turn deliver the the combustiol'i chamber; 7 I product of combustion to the breeching. The Fig. Q isanfend'elevational'view; the v'iew combustion chambers' were within the boiler being taken substantially on line 2-2 of and in a relatively inaccessible position, be- Fig.1; ingsurrounded by the water wall of the Fig. 3 is an end jview-oftherear water 25 boiler. p I wall'of the boilerbrokenaway andthe rear Oneobject of the present invention resides walls of the combustion chamber broken in'the' provisionof an improved: superlieater away to show the superheaterunits in full construction which" will permit the superlines in'thef combustion chamber spaces heater to bed'isposed in the'comb'ustion cham- Fig. 4 isga top elevationalview of one of ber' of a Scotch marine boiler insteadof re thesup'erhe'ater units; and i y 8, quiring the superheater to' be disposed else- Fig. 5 is a detail view taken substantially where, i. e. in the fire tubes or 'in breeching on line 5-5 of Fig. 4, one transverse tube beas heretofore.- ing shown infull' andthe'othertubes being further object of the: present invention shown in section. 5 resides in the provision ofa superheater'con In the drawings'in Fig. 1 there is shown a struction adapted fori'nsta'llation in the com Scotch'marine boiler provided with fire tubes bustion space of a Scotch marine boiler in 11 and with a furnace 12. The'other furwhich' the superheate'r 'units may be'passed naces 12a and 1 2?) are shown in Fig. The into'the combustion space "through thefurfurnace 12 is in communication at'its rear end nac'ewhich is associated witheach combus with an internal upwardly extending coin tion chamber; bustion chamber 13'and the furnaces 12a and A further objeot of the present invention 1212' are similarly in communication with relates tolaprovision" of'a superheater for a. combustion chambers 13a and 13b. 14 rep- Scotchmarine'boiler' in which a superheater resents the rear wall of the combustion cham- 5 is disposed in the combustion chamber of the her 13 and15 isthe external rearwa ll of'the boiler and inwhich the headers-for the super boiler. As is usual in these Scotch marine heater are disposed without the combustion boilers there is a water space 16 intermediate chamber and outside of'th'e boiler so that they 15 and 14. p are not/only accessiblebut also away from the According to the p'resent'=invention the s-uintenseheat'within the com'bustion chamber. perheater unit's aredisposedwithinthe'inter nal combustion chambers 13, 13a and 136. To provide openings through the water space 16 into the various combustion chambers, each combustion chamber has thimbles or sleeve-like members 17 and 18 disposed as shown in Fig. 1 and cooperating with walls 15 and 14 as shown to provide openings through the water space through which the tube ends of the superheater units may extend.

In Fig. 1, 19 represents a. tubular superheater unit. This unit consists of a continuous tube section bent up into the configuration shown which is substantially saddle shaped having an intermediate depression at i A clearance to permit the unit being passed into the combustion chamber through the associated furnace. This is shown by the dotted line illustration'of the unit in Fig. 1.

By disposing the superheater units in the internal combustion chamber of the Scotch marine boiler, the superheater is subjected to intense heat and such unit does not material ly restrict the flow of the hot gases enroute from the furnace to the fire tubes. The inlet and outlet headers for the various superheater units are shown at 22 and 23 respectively and such headers are disposed back of the rear water wall 15 and accordingly they are not subjected to the intense heat of the gases within the combustion chamber. Connection of the units to these headers maybe made in any suitable manner preferably by the flanged connection shown.

It will be understood thatthere is a superheater unit 19a in combustion chamber 13a and another unit 19?) in combustion chamber 13?; (see Fig. 3). i

Figs. 4 and 5 show the manner of bending up the tubular unit to provide for bringing out the outletand inlet tube ends 20 and 21 in one place so that thev can pass through the openings provided by the ferrules 17 and 18. In the operation of superheaters. I have found it advantageous and desirable to provide for admitting regulated quantities of water from the water space ofthe boiler to the inlet header of the superheater. For this purpose the pipe connection 25 is provided disposed as shown in Figs. 1 and 2. This pipe connection extending through check valve 26 and connecting at its upper end to the header 22 and its lower end to the water space of the boiler as shown. The checlr valve opens in the direction of the arrows. This pipe connection permits a comparatively small quantity of water to be admitted to the inlet header into the superheaters and this water is converted into steam in passing through the superheater.

I have also found it desirable to dry out the steam passing from the steam space of the boiler to the inlet header. This is preferably eil ected by providing a nozzle 27 Fig. 2. and a standpipe 28 in which standpipe the steam velocity is reduced. The standpipe 28 is of considerable height so that the slugs of water in the steam can have their velocity reduced so that they can fall back into the boil- Suitable connection 29 is made from the tube of the standpipe to the inlet header 22.

I have alsofound it desirable't'o provide a connection pipe 30 also provided with a check valve 31 and disposed intermediate the outlet header 23 and the steam space of the boiler. This connection permits a slight flow of steam by thermo-siphonic action from the header 23 back tothe steam spacejof the boiler.

The above arrangement of; water supplying pipes, steam transfer pipe and steam noz zle, etc, are more fully described and claimed in my copending" application Serial No. 306,699, filed September 18, 1928.,

What I claim is:

1. A superheater for a Scotch marine boiler, said boiler having a combustion chamber and a furnace leading thereinto, said superheater comprising a tube unit formed from one continuous length of tubingwith' a multiplicity of loops and tube portions connecting saidloops with a saddle shaped configuration to provide for increased length ofthe tubing unit while still maintaining clearance for inserting the unit into the combustion chamber through the furnace of the boiler.

2. An improved superheater unit comprising'a multiplicity of connected loops formed of continuous tubing, adapted-for disposition within the internal combustion chamber of a Scotch marine boiler, which combustion chamber is in communication with the furnace of the boiler, said multiple looped'continuous tubing unit being saddle shaped to provide for greater length and area of the continuous tubing unit while maintaining clearance and to permit the inserting of the unit into the combustion chamber through the furnace. s

3. The invention set forth in claim 2 in which extended tubular legs are provided on each unit at the ends of the tubular sections tion chamber and a furnace communicating ice its

therewith, said superheater unit being formed of continuous tubing, said unit having a single inlet end connection and a single outlet end connection with the intermediate tubing being continuous from the inlet connection to the outlet connection and comprised of a multiplicity of loops, said unit being of saddle shaped configuration to provide for a greater length of the continuous tubing loops and greater area of heat absorbing surface While affording a configuration of the unit which permits of inserting the unit into the combustion chamber through the furnace.

5. A superheater unit for installation in locations where furnace and combustion chamber proportions and configurations give restricted clearance for superheater installation when the superheater unit is installed completely assembled and fabricated, said unit being formed from a continuous length of tubing with a multiplicity of intermediate looped portions and single inlet and outlet end portions, said unit being shaped with a saddle shaped configuration to permit tilting and warping of the unit during installation in passing'the unit through a restricted opening so that a unit of the saddle shaped configuration may be more readily installed than a corresponding unit which lacks the saddle shaped configuration.

In testimony whereof I hereto afiix my signature.

EDWARD ARTHUR GEOGHEGAN. 

